- May 06, 2010
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Anton Blanchard authored
Convert hotplug-cpu code to new cpumask API. Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Anton Blanchard authored
Dynamically allocate cpu_sibling_map and cpu_core_map cpumasks. We don't need to set_cpu_online() the boot cpu in smp_prepare_boot_cpu, init/main.c does it for us. We also postpone setting of the boot cpu in cpu_sibling_map and cpu_core_map until when the memory allocator is available (smp_prepare_cpus), similar to x86. Signed-off-by:
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Anton Blanchard authored
Use new cpumask API in /proc/cpuinfo code. Signed-off-by:
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Anton Blanchard authored
This separates the per cpu output from the summary output at the end of the file, making it easier to convert to the new cpumask API in a subsequent patch. Signed-off-by:
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Anton Blanchard authored
Use the new cpumask API and add some comments to clarify how get_irq_server works. Signed-off-by:
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Anton Blanchard authored
Use new cpumask functions in pseries SMP startup code. Signed-off-by:
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Anton Blanchard authored
Use new cpumask functions in iseries SMP startup code. Signed-off-by:
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Anton Blanchard authored
Use new cpumask_* functions, and dynamically allocate cpumask in fixup_irqs. Signed-off-by:
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Anton Blanchard authored
Use the new cpumask_* functions and dynamically allocate the cpumask in smp_cpus_done. Signed-off-by:
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Anton Blanchard authored
Use cpumask_first, cpumask_next in rtasd code. Signed-off-by:
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Anton Blanchard authored
Change &cpu_online_map to cpu_online_mask. Signed-off-by:
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Benjamin Herrenschmidt authored
As explained in commit 1c0fe6e3, we want to call the architecture independent oom killer when getting an unexplained OOM from handle_mm_fault, rather than simply killing current. Cc: linuxppc-dev@ozlabs.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linux-arch@vger.kernel.org Signed-off-by:
Nick Piggin <npiggin@suse.de> Signed-off-by:
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Mark Nelson authored
We need to keep track of the backing pages that get allocated by vmemmap_populate() so that when we use kdump, the dump-capture kernel knows where these pages are. We use a simple linked list of structures that contain the physical address of the backing page and corresponding virtual address to track the backing pages. To save space, we just use a pointer to the next struct vmemmap_backing. We can also do this because we never remove nodes. We call the pointer "list" to be compatible with changes made to the crash utility. vmemmap_populate() is called either at boot-time or on a memory hotplug operation. We don't have to worry about the boot-time calls because they will be inherently single-threaded, and for a memory hotplug operation vmemmap_populate() is called through: sparse_add_one_section() | V kmalloc_section_memmap() | V sparse_mem_map_populate() | V vmemmap_populate() and in sparse_add_one_section() we're protected by pgdat_resize_lock(). So, we don't need a spinlock to protect the vmemmap_list. We allocate space for the vmemmap_backing structs by allocating whole pages in vmemmap_list_alloc() and then handing out chunks of this to vmemmap_list_populate(). This means that we waste at most just under one page, but this keeps the code is simple. Signed-off-by:Mark Nelson <markn@au1.ibm.com> Signed-off-by:
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Wolfram Sang authored
Drop NO_IRQ as 0 is the preferred way to describe 'no irq' (http://lkml.org/lkml/2005/11/21/221 ). This change is safe, as the driver is only used on powerpc, where NO_IRQ is 0 anyhow. Signed-off-by:
Wolfram Sang <w.sang@pengutronix.de> Acked-by:
Grant Likely <grant.likely@secretlab.ca> Cc: Sean MacLennan <smaclennan@pikatech.com> Cc: Ben Dooks <ben-linux@fluff.org> Acked-by:
Sean MacLennan <smaclennan@pikatech.com> Signed-off-by:
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Wolfram Sang authored
Drop NO_IRQ as 0 is the preferred way to describe 'no irq' (http://lkml.org/lkml/2005/11/21/221 ). This change is safe, as the driver is only used on powerpc, where NO_IRQ is 0 anyhow. Signed-off-by:
Jochen Friedrich <jochen@scram.de> Signed-off-by:
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Wolfram Sang authored
Drop NO_IRQ as 0 is the preferred way to describe 'no irq' (http://lkml.org/lkml/2005/11/21/221 ). This change is safe, as the driver is only used on powerpc, where NO_IRQ is 0 anyhow. Signed-off-by:
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Martyn Welch authored
Currently the parsing of the device tree in arch/powerpc/include/asm/parport.h assumes that the interrupt provided in the parallel port node is a valid virtual irq. The values for the interrupts provided in the device tree should have meaning in the context of the driver for the specific interrupt controller to which the interrupt is connected and irq_of_parse_and_map() should be used to determine the correct virtual irq. Signed-off-by:
Martyn Welch <martyn.welch@ge.com> Signed-off-by:
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Benjamin Herrenschmidt authored
So we tried to speed things up a bit using flush_hash_pages() directly but that falls over on 603 of course meaning we fail to flush the TLB properly and we may even end up having it corrupt memory randomly by accessing a hash table that doesn't exist. This removes the "optimization" by always going through flush_tlb_page() for now at least. Signed-off-by: -
Michael Neuling authored
Currently we always call start-cpu irrespective of if the CPU is stopped or not. Unfortunatley on POWER7, firmware seems to not like start-cpu being called when a cpu already been started. This was not the case on POWER6 and earlier. This patch checks to see if the CPU is stopped or not via an query-cpu-stopped-state call, and only calls start-cpu on CPUs which are stopped. This fixes a bug with kexec on POWER7 on PHYP where only the primary thread would make it to the second kernel. Reported-by:
Ankita Garg <ankita@linux.vnet.ibm.com> Cc: <stable@kernel.org> Signed-off-by:
Michael Neuling <mikey@neuling.org> Signed-off-by:
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Michael Neuling authored
This moves query_cpu_stopped() out of the hotplug cpu code and into smp.c so it can called in other places and renames it to smp_query_cpu_stopped(). It also cleans up the return values by adding some #defines Cc: <stable@kernel.org> Signed-off-by:
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- May 05, 2010
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Stefan Roese authored
By setting "reset_type" to one of the following values, the default software reset mechanism may be overidden. Here the possible values of "reset_type": 1 - PPC4xx core reset 2 - PPC4xx chip reset 3 - PPC4xx system reset (default) This will be used by a new PPC440SPe board port, which needs a "chip reset" instead of the default "system reset" to be asserted. Signed-off-by:
Stefan Roese <sr@denx.de> Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by:
Josh Boyer <jwboyer@linux.vnet.ibm.com> Signed-off-by:
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Dave Kleikamp authored
A defconfig for the IBM ISS 476 simulator Signed-off-by:
Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by:
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Torez Smith authored
This is a trivial 4xx plaform that uses the new simple bsp from Josh and is handy to use in simulators such as ISS or even Mambo who don't properly implement most of the actual devices in the SoC but really only the core. Signed-off-by:
Torez Smith <lnxtorez@linux.vnet.ibm.com> Signed-off-by:
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Dave Kleikamp authored
476 requires an isync after loading MMU and debug related SPR's. Some of these are in performance-critical paths and may need to be optimized, but initially, we're playing it safe. Signed-off-by:
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Dave Kleikamp authored
The 47x core's MCSR varies from 44x, so it needs it's own machine check handler. Signed-off-by:
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Dave Kleikamp authored
This patch adds the base support for the 476 processor. The code was primarily written by Ben Herrenschmidt and Torez Smith, but I've been maintaining it for a while. The goal is to have a single binary that will run on 44x and 47x, but we still have some details to work out. The biggest is that the L1 cache line size differs on the two platforms, but it's currently a compile-time option. Signed-off-by:
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Dave Kleikamp authored
The 47x platform supports multiple cores and shares code with 44x. Break out code that is common for initializing the primary and secondary cpus into a function which can be called for both. Signed-off-by:
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Torez Smith authored
This patch adds a marker to the exception stack frame to aid in debugging. It's already inserted on other platforms and xmon recognizes it and identifies exception frames when showing stack traces. Signed-off-by:
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- Apr 13, 2010
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Benjamin Herrenschmidt authored
This reverts commit 7545ba6f. It breaks eHEA among other issues
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- Apr 07, 2010
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Mahesh Salgaonkar authored
This patch ports the kprobe-based event tracer to powerpc. This patch is based on x86 port. This brings powerpc on par with x86. Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Acked-by:
Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by:
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Benjamin Herrenschmidt authored
Adds support for suspend/resume for VIO devices. This is needed for support for HMC initiated hibernation. Signed-off-by:
Brian King <brking@linux.vnet.ibm.com> Signed-off-by:
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Akinobu Mita authored
Replace open-coded rate limiting logic with __ratelimit(). Signed-off-by:
Akinobu Mita <akinobu.mita@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@ozlabs.org Signed-off-by:
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Anton Blanchard authored
The current setting for SECTION_SIZE_BITS is quite small compared to everyone else: arch/powerpc/include/asm/sparsemem.h:#define SECTION_SIZE_BITS 24 arch/sparc/include/asm/sparsemem.h:#define SECTION_SIZE_BITS 30 arch/ia64/include/asm/sparsemem.h:#define SECTION_SIZE_BITS (30) arch/s390/include/asm/sparsemem.h:#define SECTION_SIZE_BITS 28 arch/x86/include/asm/sparsemem.h:# define SECTION_SIZE_BITS 27 And it has proven to be an issue during boot on very large machines. If hotplug memory is enabled, drivers/base/memory.c does this: for (i = 0; i < NR_MEM_SECTIONS; i++) { if (!present_section_nr(i)) continue; err = add_memory_block(0, __nr_to_section(i), MEM_ONLINE, 0, BOOT); if (!ret) ret = err; } Which creates a sysfs directory for every 16MB of memory. As a result I'm seeing up to 30 minutes spent here during boot: c000000000248ee0 .__sysfs_add_one+0x28/0x128 c0000000002492a8 .sysfs_add_one+0x38/0x188 c000000000249c88 .create_dir+0x70/0x138 c000000000249d98 .sysfs_create_dir+0x48/0x78 c00000000032bad8 .kobject_add_internal+0x140/0x308 c00000000032beb4 .kobject_init_and_add+0x4c/0x68 c00000000046c2c0 .sysdev_register+0xa0/0x220 c00000000047b1dc .add_memory_block+0x124/0x1e8 c0000000008d1f28 .memory_dev_init+0xf4/0x168 c0000000008d1b64 .driver_init+0x50/0x64 c000000000890378 .do_basic_setup+0x40/0xd4 I assume there are some O(n^2) issues in sysfs as we add all the memory nodes. Bumping SECTION_SIZE_BITS to 256 MB drops the time to about 10 seconds and results in a much smaller /sys. Signed-off-by: -
Anton Blanchard authored
We have had issues in the past with ibm,os-term initiating shutdown of a partition. This is confusing to the user, especially if panic_timeout is non zero. The temporary fix was to avoid calling ibm,os-term if a panic_timeout was set and since we set it on every boot we basically never call ibm,os-term. An extended version of ibm,os-term has since been implemented which gives us the behaviour we want: "When the platform supports extended ibm,os-term behavior, the return to the RTAS will always occur unless there is a kernel assisted dump active as initiated by an ibm,configure-kernel-dump call." This patch checks for the ibm,extended-os-term property and calls ibm,os-term if it exists. Signed-off-by:
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Anton Blanchard authored
I noticed /proc/sys/vm/zone_reclaim_mode was 0 on a ppc64 NUMA box. It gets enabled via this: /* * If another node is sufficiently far away then it is better * to reclaim pages in a zone before going off node. */ if (distance > RECLAIM_DISTANCE) zone_reclaim_mode = 1; Since we use the default value of 20 for REMOTE_DISTANCE and 20 for RECLAIM_DISTANCE it never kicks in. The local to remote bandwidth ratios can be quite large on System p machines so it makes sense for us to reclaim clean pagecache locally before going off node. The patch below sets a smaller value for RECLAIM_DISTANCE and thus enables zone reclaim. Signed-off-by: -
Wolfram Sang authored
Fix I2C-drivers which missed setting clientdata to NULL before freeing the structure it points to. Also fix drivers which do this _after_ the structure was freed already. Signed-off-by:
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Julia Lawall authored
Use set_cpus_allowed_ptr rather than set_cpus_allowed. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/ ) // <smpl> @@ expression E1,E2; @@ - set_cpus_allowed(E1, cpumask_of_cpu(E2)) + set_cpus_allowed_ptr(E1, cpumask_of(E2)) @@ expression E; identifier I; @@ - set_cpus_allowed(E, I) + set_cpus_allowed_ptr(E, &I) // </smpl> Signed-off-by:
Julia Lawall <julia@diku.dk> Signed-off-by:
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Julia Lawall authored
In some error handling cases the lock is not unlocked. A simplified version of the semantic patch that finds this problem is as follows: (http://coccinelle.lip6.fr/ ) // <smpl> @r exists@ expression E1; identifier f; @@ f (...) { <+... * spin_lock_irqsave (E1,...); ... when != E1 * return ...; ...+> } // </smpl> Signed-off-by:
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Julia Lawall authored
Add an unlock before exiting the function. A simplified version of the semantic patch that finds this problem is as follows: (http://coccinelle.lip6.fr/ ) // <smpl> @r exists@ expression E1; identifier f; @@ f (...) { <+... * spin_lock_irq (E1,...); ... when != E1 * return ...; ...+> } // </smpl> Signed-off-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Julia Lawall authored
kasprintf combines kmalloc and sprintf, and takes care of the size calculation itself. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/ ) // <smpl> @@ expression a,flag; expression list args; statement S; @@ a = - \(kmalloc\|kzalloc\)(...,flag) + kasprintf(flag,args) <... when != a if (a == NULL || ...) S ...> - sprintf(a,args); // </smpl> Signed-off-by:
Nathan Fontenot <nfont@austin.ibm.com> Signed-off-by:
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